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Which of the following expressions can be written using the identity for the difference of two cubes?

Answer and explanation

Correct answer: \(a^3-b^3\)

A difference of two cubes has the form \(a^3-b^3\) and factorises as \((a-b)(a^2+ab+b^2)\). \(a^3+b^3\) is a sum of cubes, so it uses a different identity. Exam tip: for a difference, the first binomial is \(a-b\).

Related tags

Algebraic IdentitiesDifference Of CubesFactorisationClass 9 MathematicsAlgebraExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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